- Alexander Zverev calls for rule change after controversy in his Madrid Open win over Alejandro Davidovich Fokina The Tennis Gazette
- Alex Zverev given warning after using phone to take photo of disputed ball mark in Madrid Open victory CNN
- Alexander Zverev wins amid controversy in Madrid Tennis.com
- Zverev survives Davidovich Fokina scare in Madrid ATP Tour
- Zverev gets a warning for taking photo of ball mark at Madrid Open AP News